during assisted reproductive technology (art) procedures, the transfer of a single embryo dramatically reduces the rate of multiple pregnancy. proper information, therefore, should be delivered to patients before embryo transfer. in many countries, regulations limit, according to age of the patient, the number of embryos to be transferred. selective fetal reduction should not be considered as a...

the performance of a γ-al 2 o 3 /n-decane nanofluid shell-and-tube heat exchanger in a biomass heating plant is analyzed to specify the optimum condition based on the maximum heat transfer rate and performance index for wide range of nanoparticle volume fraction (0–7%). compared with pure          n-decane, the obtained results in this research show that by using γ-al 2 o 3 /n-decane nanofluid ...

one way to increase the heat transfer is to use perforated twisted tapes with different hole diameters, which largely improve heat transfer with an increase in the heat transfer area at the constant volume and more mixed flow. in the previous studies, the effect of nanofluids with perforated twisted tapes is less studied. in this work, the performance of water / iron oxide nanofluid in a double...

We are all familiar with stories of the daring voyages of discoverers and researchers who braved the seas and severe privation in the service of truth and enlightenment. The title of this article, "Knowledge Transfer and Science Transfer", and the fact that it is included in the "Europe and the World" thread may conjure up similar images but hopefully also the counter reaction: these clichés, w...

Roughness elements or turbulence promoters have been widely used to enhance heat transfer in cooling passages of modern gas turbine blades. Although such ribs substantially enhance heat transfer, the heat transfer coefficient is reduced immediately at corner downstream of each rib, creating hot spots. To remove such hot spots some of the ribs can be detached from the channel walls. In this pape...

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Buoyancy driven heat transfer of Cu-water nanofluid in a differentially heated square cavity with an inner adiabatic square baffle at different positions is studied numerically. The left and right walls of the cavity are at temperatures of Th and Tc, respectively that Th > Tc, while the horizontal walls are insulated. The governing equations are discretized using the finite volume method while ...